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The Mapping Specialist will review the WHO ICD-10 Alphabetical Index to Diseases and Nature of Injury Volume 3 to identify any essential modifiers which represent SNOMED CT concepts that are descendants of: a) the source concept to be mapped, or b) the source concept etiology SNOMED CT code when dagger and asterisk guidance requires a separate target for cause of the disorder. The Mapping Specialist will add new Map members with the associated target specific to the alpha reference as context dependent maps with a mapRule.For example

Examples (Etiology and Manifestation):

Exemplar: Dagger & Asterisk: #3

• B00.5, Herpes viral ocular disease, and H22.0, Iridocyclitis in infectious and parasitic diseases classified elsewhere

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• , with mapAdvice THIS CODE MAY BE USED IN THE PRIMARY POSITION WHEN THE MANIFESTATION IS THE PRIMARY FOCUS OF CARE appended to H22.0.

Upon reviewing the WHO alphabetic index, the Mapping Specialist notes the following codes:

Iridocyclitis
-herpes, herpetic (simplex) B00.5† H22.0*

OR

Herpes, Herpetic
-iridocyclitis (simplex) B00.5† H22.0*

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Example

• K43.0, Ventral hernia with obstruction, without gangrene.

Upon reviewing the WHO alphabetic index, the Mapping Specialist notes Incisional hernia has a reference to "see Hernia, ventral". To determine the target, the Mapping Specialist follows the 'see' reference and checks under "Hernia, ventral". ICD-10 code K43.0 is listed under Hernia, ventral, with, obstruction. In addition, there are essential and nonessential modifiers to consider:

Hernia, hernial (acquired) (recurrent) K46.9
-incisional — see Hernia, ventral

Hernia, hernial (acquired) (recurrent) K46.9
-ventral K43.9
--with
---gangrene (and obstruction) K43.1
---obstruction K43.0

Mapping for concepts of poisoning and overdose will require analysis of the Alphabetic Index; 's Table of Drugs and Chemicals. This table organizes the default target codes for mapping drug or chemical mishaps including advice for drugs or chemicals along with the corresponding codes for adverse situations including accidental events, intentional self-harm, poisoning of undetermined intent, and adverse effects in therapeutic use. This table also may include essential modifiers which require attention for possible exclusion rules. For example, when mapping the SNOMED CT source concept

In this case, the default target code for mapping of Antidepressant poisoning is T43.2 for mapGroup one and X41 for mapGroup two based upon WHO advice of assumption of accidental intent when to assume an accident when intent of poisoning is unspecified. Note that required modifiers are identified for this map for agents MAO inhibitors, triazolpyridine, tricyclic and tetracyclic antidepressants.
Atomic mapping (obsolete)When the Mapping Specialist encounters a source concept with ten or fewer descendants, only the main concept will be examined for mapping.